<p>The usual definition “burrow” is a hole dug in the ground by an animal for shelter. The secondary definition according to dictionary.com is “a place of retreat; shelter or refuge.”</p>
<p>The word “placid” in line 5 supports “peaceful” and “burrow” is a place of security. So B is well-supported by the context.</p>
<p>C. is not supported because “work required to sustain a home” is not mentioned nor implied.</p>